We've featured a few ways to create a home surveillance system, but if you'd like…
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Instead of using an AppleScript (and having to enable access to assistive devices), you can actually just run a few Terminal commands to tell FaceTime to auto-accept incoming calls. To accept an incoming call from a specific number or Apple ID, just run:

After that, you can just FaceTime your home computer from your iPhone or iPod touch to check in on your house (or see if that delivery has arrived yet). Note that there isn't a Terminal command to remove a user from your auto-accept list; you'll have to open up com.apple.FaceTime.plist in ~/Library/Preferences and remove items from the AutoAcceptInvitesFrom key if you want to remove people. Hit the link to read more about FaceTime's hidden preferences.